I have lived in both places. I don't really think they're comparable. Firstly, the food they're known for is so different- subs and snacks vs burgers and fried food.

Secondly, Sheetz is allergic to urban locations, a car is pretty necessary to find one. We don't actually have a single one in the city of Pittsburgh. It's a true gas station chain. Wawa has a large number of locations with no gas pumps at all and tons of locations in urban or high-density suburbs.

So if you're an urbanite who loves subs, Wawa is for you. If you're suburban/rural and prefer burgers and fries, Sheetz is your place. If you live in Pittsburgh the city, you're SOL because we have neither lol